From: Simone Piccardi <piccardi@gnulinux.it>
Date: Sun, 9 Sep 2001 22:45:34 +0000 (+0000)
Subject: Completate le aggiunte della GPL per i programmi
X-Git-Url: https://gapil.gnulinux.it/gitweb/?a=commitdiff_plain;h=54d27b07aee6d293931ee274a3ede927f517f2cf;p=gapil.git

Completate le aggiunte della GPL per i programmi
---

diff --git a/prochand.tex b/prochand.tex
index 8f8beaf..41d7a34 100644
--- a/prochand.tex
+++ b/prochand.tex
@@ -278,20 +278,54 @@ numero di figli specificato a linea di comando; il codice completo, compresa
 la parte che gestisce le opzioni a riga di comando, è disponibile nel file
 \file{ForkTest.c}.
 
-Decifrato il numero di figli da creare il ciclo principale del programma
+Decifrato il numero di figli da creare, il ciclo principale del programma
 (\texttt{\small 28--40}) esegue in successione la creazione dei processi figli
-(\texttt{\small 29--31}) controllando il successo della chiamata a
-\func{fork}; ciascun figlio (\texttt{\small 29--31}) si limita a stampare il
+controllando il successo della chiamata a \func{fork} (\texttt{\small
+  29--31}); ciascun figlio (\texttt{\small 29--31}) si limita a stampare il
 suo numero di successione, attendere 2 secondi e scrivere un messaggio prima
 di uscire. Il processo padre invece (\texttt{\small 29--31}) stampa un
-messaggio di creazione e procede nell'esecuzione del ciclo.
-
-In generale\footnote{anche se nel kernel 2.4.x è stato introdotto un
+messaggio di creazione e procede nell'esecuzione del ciclo. Se eseguiamo il
+comando otterremo:
+\begin{verbatim}
+[piccardi@selidor sources]$ ./forktest 5
+Test for forking 5 child
+Spawned 1 child, pid 840 
+Child 1 successfully executing
+Child 2 successfully executing
+Spawned 2 child, pid 841 
+Spawned 3 child, pid 842 
+Child 3 successfully executing
+Spawned 4 child, pid 843 
+Child 4 successfully executing
+Child 5 successfully executing
+Spawned 5 child, pid 844 
+[piccardi@selidor sources]$ Child 2 exiting
+Child 1 exiting
+Child 4 exiting
+Child 3 exiting
+Child 5 exiting
+\end{verbatim}
+
+
+Come si vede non si può dire quale processo fra il padre ed il figlio venga
+eseguito per primo\footnote{anche se nel kernel 2.4.x era stato introdotto un
   meccanismo che metteva in esecuzione sempre il xxx per primo (TODO
-  recuperare le informazioni esatte)} non si può dire quale processo fra il
-padre ed il figlio venga eseguito per primo dopo la chiamata a \func{fork},
-per cui se i due processi devono essere sincronizzati occorre ricorrere ad un
-qualche meccanismo di intercomunicazione.
+  recuperare le informazioni esatte)} dopo la chiamata a \func{fork}, nel caso
+mostrato sopra ad esempio si può notare come dopo la creazione il secondo ed
+il quinto figlio sia stato stati eseguiti per primi, mantre per gli altri
+figli è stato eseguito per primo il padre. In generale l'ordine di esecuzione
+dipenderà dalla situazione particolare in si trova la macchina al momento
+della chiamata, risultando del tutto impredicibile, per questo motivo se i due
+processi devono essere sincronizzati occorrerà ricorrere ad un opportuno
+meccanismo di intercomunicazione.
+
+Si ricordi inoltre che, essendo i segmenti di memoria utilizzati dai singoli
+processi completamente separati, le modifiche delle variabili nei processi
+figli (come l'incremento di \var{i} in \texttt{\small 33}) saranno effettive
+solo per essi, e non hanno alcun effetto sul valore che le stesse variabili
+hanno nel processo padre.
+
+
 
 
 \subsection{Le funzioni \texttt{wait} e  \texttt{waitpid}}
diff --git a/sources/ElemDaytimeTCPClient.c b/sources/ElemDaytimeTCPClient.c
index d241f16..d049b7d 100644
--- a/sources/ElemDaytimeTCPClient.c
+++ b/sources/ElemDaytimeTCPClient.c
@@ -19,14 +19,14 @@
 /****************************************************************
  *
  * Program daytime: 
- * Simple TCP client for daytime service (port 13)
+ * Elementary TCP client for daytime service (port 13)
  *
  * Author: Simone Piccardi
  * Apr. 2001
  *
  * Usage: daytime -h give all info's
  *
- * $Id: ElemDaytimeTCPClient.c,v 1.1 2001/09/09 17:39:15 piccardi Exp $ 
+ * $Id: ElemDaytimeTCPClient.c,v 1.2 2001/09/09 22:45:34 piccardi Exp $ 
  *
  ****************************************************************/
 /* 
diff --git a/sources/ElemDaytimeTCPServer.c b/sources/ElemDaytimeTCPServer.c
index 057ce97..9ab656a 100644
--- a/sources/ElemDaytimeTCPServer.c
+++ b/sources/ElemDaytimeTCPServer.c
@@ -1,6 +1,6 @@
-/* ElemDaytimeTCPClient.c
+/* ElemDaytimeTCPServer.c
  * 
- * Copyright (C) 2000 Simone Piccardi
+ * Copyright (C) 2001 Simone Piccardi
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-//****************************************************************
+/****************************************************************
  *
  * Program daytimed: 
  * Elementary TCP server for daytime service (port 13)
@@ -24,9 +24,9 @@
  * Author: Simone Piccardi
  * Apr. 2001
  *
- * Usage: daytimed
+ * Usage: daytimed -h give all info
  *
- * $Id: ElemDaytimeTCPServer.c,v 1.2 2001/09/09 17:39:15 piccardi Exp $ 
+ * $Id: ElemDaytimeTCPServer.c,v 1.3 2001/09/09 22:45:34 piccardi Exp $ 
  *
  ****************************************************************/
 /* 
diff --git a/sources/ElemEchoTCPClient.c b/sources/ElemEchoTCPClient.c
index eafdc81..57b8fa1 100644
--- a/sources/ElemEchoTCPClient.c
+++ b/sources/ElemEchoTCPClient.c
@@ -1,6 +1,24 @@
+/* ElemEchoTCPClient.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
 /****************************************************************
  *
- * Program SimpleEchoTCPClient: 
+ * Program ElemEchoTCPClient.c
  * Simple TCP client for echo service (port 7)
  *
  * Author: Simone Piccardi
@@ -8,7 +26,7 @@
  *
  * Usage: echo -h give all info's
  *
- * $Id: ElemEchoTCPClient.c,v 1.2 2001/06/20 22:03:37 piccardi Exp $
+ * $Id: ElemEchoTCPClient.c,v 1.3 2001/09/09 22:45:34 piccardi Exp $
  *
  ****************************************************************/
 /* 
diff --git a/sources/ErrCode.c b/sources/ErrCode.c
index 58f5491..5106885 100644
--- a/sources/ErrCode.c
+++ b/sources/ErrCode.c
@@ -1,3 +1,21 @@
+/* ErrCode.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
 /****************************************************************
  *
  * Program ErrCode.c: 
@@ -8,7 +26,7 @@
  *
  * Usage: errcode -h give all info's
  *
- * $Id: ErrCode.c,v 1.1 2001/09/09 17:39:15 piccardi Exp $ 
+ * $Id: ErrCode.c,v 1.2 2001/09/09 22:45:34 piccardi Exp $ 
  *
  ****************************************************************/
 /* 
diff --git a/sources/ForkTest.c b/sources/ForkTest.c
index da38629..09035d5 100644
--- a/sources/ForkTest.c
+++ b/sources/ForkTest.c
@@ -1,3 +1,21 @@
+/* ForkTest.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
 /****************************************************************
  *
  * Program ForkTest.c: 
@@ -8,7 +26,7 @@
  *
  * Usage: forktest -h give all info's
  *
- * $Id: ForkTest.c,v 1.1 2001/09/09 17:39:15 piccardi Exp $
+ * $Id: ForkTest.c,v 1.2 2001/09/09 22:45:34 piccardi Exp $
  *
  ****************************************************************/
 /* 
@@ -69,15 +87,15 @@ int main(int argc, char *argv[])
     /* loop to fork children */
     for (i=0; i<nchild; i++) {
 	if ( (pid = fork()) < 0) {
-	    printf("Error on %d child creation, %s\n", i, strerror(errno));
+	    printf("Error on %d child creation, %s\n", i+1, strerror(errno));
 	}
 	if (pid == 0) {   /* child */
-	    printf("Child %d successfully executing\n", i++);
+	    printf("Child %d successfully executing\n", ++i);
 	    sleep(2);
 	    printf("Child %d exiting\n", i);
 	    exit(0);
 	} else {          /* parent */
-	    printf("Spawned %d child, pid %d \n", i, pid);
+	    printf("Spawned %d child, pid %d \n", i+1, pid);
 	}
     }
     /* normal exit */
diff --git a/sources/Makefile b/sources/Makefile
index c1976a7..64293b7 100644
--- a/sources/Makefile
+++ b/sources/Makefile
@@ -8,6 +8,8 @@ CFLADJ=-c
 
 OBJ = SockRead.o SockWrite.o
 
+all: forktest errcode echo echod daytimed iterdaytimed daytime
+
 forktest: ForkTest.c
 	$(CC) $(CFLAGS) $^ -o $@
 
@@ -35,7 +37,7 @@ $(OBJ): wrappers.h
 
 .PHONY : clean
 clean:
-	rm -f daytime iterdaytimed daytimed echod echo errcode
+	rm -f daytime iterdaytimed daytimed echod echo errcode forktest
 	rm -f *~
 	rm -f *.o
 
diff --git a/sources/SimpleEchoTCPClient.c b/sources/SimpleEchoTCPClient.c
index 31adf9f..5661f87 100644
--- a/sources/SimpleEchoTCPClient.c
+++ b/sources/SimpleEchoTCPClient.c
@@ -1,6 +1,24 @@
+/* SimpleEchoTCPClient.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
 /****************************************************************
  *
- * Program SimpleEchoTCPClient: 
+ * Program echo: 
  * Simple TCP client for echo service (port 7)
  *
  * Author: Simone Piccardi
@@ -8,7 +26,7 @@
  *
  * Usage: echo -h give all info's
  *
- * $Id: SimpleEchoTCPClient.c,v 1.3 2001/06/17 21:58:46 piccardi Exp $
+ * $Id: SimpleEchoTCPClient.c,v 1.4 2001/09/09 22:45:34 piccardi Exp $
  *
  ****************************************************************/
 /* 
diff --git a/sources/SimpleEchoTCPServer.c b/sources/SimpleEchoTCPServer.c
index 9611e36..beda574 100644
--- a/sources/SimpleEchoTCPServer.c
+++ b/sources/SimpleEchoTCPServer.c
@@ -1,6 +1,24 @@
+/* SimpleEchoTCPServer.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
 /****************************************************************
  *
- * Program echo_tcp_server.c: 
+ * Program echod: 
  * Elementary TCP server for echo service (port 7)
  *
  * Author: Simone Piccardi
@@ -8,7 +26,7 @@
  *
  * Usage: echod
  *
- * $Id: SimpleEchoTCPServer.c,v 1.3 2001/06/12 22:17:22 piccardi Exp $ 
+ * $Id: SimpleEchoTCPServer.c,v 1.4 2001/09/09 22:45:34 piccardi Exp $ 
  *
  ****************************************************************/
 /* 
diff --git a/sources/SockRead.c b/sources/SockRead.c
index 5a7ba88..a018f33 100644
--- a/sources/SockRead.c
+++ b/sources/SockRead.c
@@ -1,3 +1,32 @@
+/* SockRead.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Routine SockRead
+ * Routine to read an exact number of bytes from a socket
+ *
+ * Author: Simone Piccardi
+ * Jun. 2001
+ *
+ * $Id: SockRead.c,v 1.3 2001/09/09 22:45:34 piccardi Exp $ 
+ *
+ ****************************************************************/
 #include <unistd.h>
 #include <errno.h>
 
diff --git a/sources/SockWrite.c b/sources/SockWrite.c
index 466807c..c0a41d9 100644
--- a/sources/SockWrite.c
+++ b/sources/SockWrite.c
@@ -1,3 +1,32 @@
+/* SockWrite.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Routine SockWrite
+ * Routine to write an exact number of bytes into a socket
+ *
+ * Author: Simone Piccardi
+ * Jun. 2001
+ *
+ * $Id: SockWrite.c,v 1.3 2001/09/09 22:45:34 piccardi Exp $ 
+ *
+ ****************************************************************/
 #include <unistd.h>
 #include <errno.h>